Definition: You are given a question on human aging. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: The gender gap is likely to be associated with male/female differences in
(A)Hormones (B)Risky behaviors and occupations (C)Proportion who smoke (D)All of the above

D